Abstract: The invention is relates to multispecific antibodies that comprise an antigen binding site that binds an extracellular part of CD137 and an antigen binding site that binds an extracellular part of a second membrane protein for use in a method of treatment of a cancer in a subject in need thereof. The invention further relates to such multispecific antibodies and methods and other aspects related thereto.

Abstract: The disclosure relates to means and methods of treating a subject for a CLEC12A positive cancer. In some embodiments the method comprises treating the subject in need thereof with two or more administrations of a bispecific antibody that binds CD3 and CLEC12A, wherein in a first administration an first amount of the bispecific antibody is administered and wherein in each of the subsequent administrations the amount of bispecific antibody is higher than the amount of bispecific antibody in the first administration. In some embodiments CLEC12A positive cancer treatment methods are provided at intervals and dosing regimens that spare hemopoietic stem cell compartment allowing for recovery of normal CLEC12A positive hemopoietic cells.

Abstract: The invention relates to a treatment using a bispecific antibody that comprises a first antigen-binding site that binds an extracellular part of ErbB-2 and a second antigen-binding site that binds an extracellular part of ErbB-3 for subjects that have cancer that has progressed after receiving a prior treatment. The prior treatment comprises a chemotherapy, a monospecific bivalent antibody comprising antigen-binding sites that bind an extracellular part of ErbB-2 or an extracellular part of ErbB-3, or a prior treatment with a tyrosine kinase inhibitor (TKI) of ErbB-2 or with a combination thereof.